Sampling $9$ boxes per every hour for the past $8$ hours has produced the following results:

$\backslash$table$[[$WEIGHT OF SAMPLE,WEIGHT OF SAMPLE,,$],[$HOUR$,($AVG$.$ OF $9$ BOXES$),$HOUR,$($AVG$.$ OF $9$ BOXES$)],[1,16\mathrm{.}1,5,16\mathrm{.}3],[2,16\mathrm{.}8,6,14\mathrm{.}8],[3,15\mathrm{.}5,7,14\mathrm{.}2],[4,16\mathrm{.}4,8,17\mathrm{.}3]]$

What is the value of $x$ double bar $($the mean of sample means$)?$ Carry two decimal places. Fill in the blank.

Answer: X double bar $=$

$2.$ Develop Chart. In this case. $.$ Determine UCL and LCL$.$ Carry two decimal places. Fill in the blank.

Answer: UCL $($Upper Control Limit$)=$ LCL $($Lower Control Limit$)=$